Hello Scott, The mystery of 'the noise' is beginning to reveal itself. I believe it is e-field in nature and related to the proximity of mains AC wiring... << As you are using a loop, my guess is tha
Hello Joerg, Like Rick wrote, this are non directional aeronautical beacons. A on-line data base can be found here: http://www.classaxe.com/dx/ndb/reu/ As the callsign for NDb's is not unique, you ha
Hello Gary, This phenomenon can be observed on many NDB's. I have been investigating thsi and it often heppens taht one sideband completely disappears, whilst the other is strong. It is similar to se
Hello Andy, There is a commercial design that uses a helical wound whip element. The main purpose is to decrease the length of the whip, so you have the same performance with a smaller overall length
Hello All, This are fine examples of dyslexia, a far more common problem than generally known. It has nothing do to with intelligence as such, as some of the most gifted persons on earth "suffered" f
Hello all, This opens up scope for a completely new DXCC challenge. For example who can achieve 5BDXCC in 20 minutes. Me thinks the contests aficiados should like this very much indeed! 73, Roelof Ba
Hello Peter, I have been using these for years now and never encountered a problem. The best way to find out though is just buy one and test it! 73, Roelof Bakker, pa0rdt
Hello Richard, It has been found that the brain of a skilled CW operator can simulate a filter as narrow as 50 Hz. The difference in noise power between a 60 Hz and 50 Hz filter is 0.79 dB. So either
Hello all, Excellent copy in a 500 Hz bandwidth this morning in the Netherlands. The signal was - 90 dBm, with the bandnoise around - 105 dBm. Receiver: PERSEUS SDR Antenna : mini-whip Best regards,
Hello all, I have received a question from someone who owns a Siemens D2155 selective level meter. I have owned one in the past, but it has move on to a good home and I am not able to check things an
Hello John, Regarding the single turn versus multiple turn loop, I have done both. For the multiple turn loop, 100 meter of 1.2 mm PCV clad electrical mains wire was wound on a wooden frame with side
Hello Alan, Gary, The harmonic of RTE 252 on 504 kHz has been reported all over Westen Europe on all kind of antennas as does not seem to be an antenna or receiver anomaly. Best regards, Roelof Bakke
Hello all, I am looking for information on the LF receiver performance of the new ICOM IC7200 transceiver. There seems to be a review in the June issue of QST. I don't have direct access to QST. Is t
Hello Dennis, Though vertical antennas (and active whips) have a bad name in regard to local noise, this is not necessarily true for reception at LF. Local noise in the electric field is attenuated b
Hello Jordan, Regarding Q, I have used potcores, but this is not necessary at all. Standard moulded rf chokes, those that look like resistors, give excellent results. I have found that the bandwidth
Hello Jordan, Sorry for the delay, I just forgot to answer your question. In the attachment you will find the circuit diagram of a tuneable pre-amplifier. I have build several of these and the freque
